I just use a regular mini flash light. I candle them at around 2weeks. Throw away translucent eggs and keep the ones that have normal dark stuff. LOL Saves me time and money from buying or building a candler. Ofcourse if you are the one to want to candle at 1 week, then build or buy a candler.
BTW, anyone own a High Intensity candler? Just curious how well they work. Are you able to see the chicks waving back at you?